O2 Oxygen Sensor Upstream Downstream for Honda Odyssey (1999-2004) 3.5L

Direct-Fit O2 Oxygen Sensor Kit for 1999-2004 Honda Odyssey (RL1)

What it Does: This matched upstream and downstream oxygen sensor kit restores closed-loop air-fuel metering and catalyst monitoring on the 1999-2004 Honda Odyssey RL1 equipped with the J35A1 / J35A4 3.5L V6.

The Stock Honda Odyssey O2 Sensor Failure

Factory oxygen sensors on the RL1 Odyssey degrade from exhaust heat cycling, oil contamination, and internal heater burnout on the J35A1 / J35A4 3.5L V6. Once the zirconia element fouls or the heater circuit opens, the ECU loses closed-loop fuel trim control. Sluggish voltage switching triggers codes such as P0131, P0135, P0141, or P0420 while forcing rich fuel mixtures.

Common Symptoms of a Failing OEM Oxygen Sensor

• Check Engine Light / DTCs: Triggers P0135, P0141, P0131, or P0420 when heater circuits or switching speeds fail.
• Poor Idle & Rich Running: Fouled elements delay feedback, causing erratic fuel trims and rough cold starts.
• High Fuel Consumption & Smog Failure: Faulty readings lock rich fueling, lowering MPG and failing emissions.

The Direct-Fit Zirconia O2 Sensor Solution

Replacing both sensors together restores balanced pre-catalyst fuel trims and accurate post-catalyst exhaust monitoring. Each unit uses a fast-response zirconia ceramic element inside a corrosion-resistant stainless steel housing with protective gas-permeable shielding. Direct-fit OEM connectors and precision threads replace 234-4098 and 234-4092 without wire splicing. Factory-spec heater resistance ensures rapid closed-loop readiness and stable ECU voltage signals.

What's Included

• 1 Upstream Oxygen Sensor
• 1 Downstream Oxygen Sensor

Technical Specifications

Compatibility

• 1999-2004 Honda Odyssey 3.5L (Uses 2 sensors; confirm engine before ordering)

Frequently Asked Questions & Fitment Warnings

Does this fit the RL1 Odyssey?

Yes. Fits the 1999-2004 Honda Odyssey J35A1 / J35A4 3.5L V6. These years use 2 sensors; confirm engine before ordering (excludes non-Odyssey applications).

Will this clear P0135, P0141, or P0420 codes?

Yes, for sensor faults. New sensors clear heater codes (P0135, P0141) and slow-response faults, though a failed catalyst causing P0420 requires converter service.

Is wire splicing required for installation?

No. Direct-fit plugs match 234-4098 and 234-4092 for plug-and-play installation; torque cleanly to factory spec.

The Honda Precision Standard

Engineered to OEM resistance and switching specs, this sensor set keeps your RL1 Odyssey efficient and CEL-free.